The only drama at the end was whether he'd make birdie on the par-5 18th to break Rory McIlroy's scoring record in relation to par. "That's probably one of the coolest things I've ever experienced and to do it on Father's Day it's pretty neat. I can't fault his work ethic, which is a massive part of it for me". "And I built a lot of confidence off of that". "And the more patient that I can become, the more times I'll put myself in this situation".
The 2010 US Open victor Graeme McDowell left Erin Hills at four-over-par, and he admitted on twitter after Thursday's round that he "Felt uncomfortable on the track today and just didn't play well".
"It bites a little bit right now", Harman said afterwards. "The conditions were so tough".
Matsuyama's 66 was the lowest round of the day, while England's Tommy Fleetwood (72) finished a shot back in fourth at 11-under.
It all came together this week for the talented Koepka, who said he practiced patience and it paid off.
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But the turning point in a gripping war of nerves came just after the turn when Harman struggled through back-to-back bogeys on the 12th and 13th.
The American finished four shots clear of Japan's Hideki Matsuyama, who also finished runner-up to Koepka in his only other win at the Waste Management Phoenix Open in 2015.
"Today I didn't play how I wanted to but it was a great week". Between conversations I've had with Claude [Harmon III] and Pete Cowan sat me down, I think, on Tuesday, and kind of had a conversation with me just kind of staying patient, not trying to win. "I've done it before, but he did it today".
Koepka, 27, claimed his first major on Sunday, carding a five-under 67 in the final round to secure a four-stroke victory.
Brooks Koepka received a short piece of advice from a valuable source on the eve of the final round at the U.S. Open.
The 25-year-old Japanese star had two of the best rounds of the tournament - he shot 65 on Friday - but a 2-over 74 in his opening round loomed large as the scores got lower and lower at a forgiving Erin Hills.
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Brooks Koepka traveled around the world to find his game.
It looked as if it was going to be a two-man race between Koepka and Harman, the third round leader, after the first few holes.
Starting the final round with a bunched leaderboard, Koepka and Harman emerged from the pack to trade blows throughout the front nine. He duly missed to drop back to 13 under.
Fleetwood, who was hoping to become only the third English victor since 1924 after Tony Jacklin (1970) and Justin Rose (2013), began the day in a tie for second with Koepka and made an encouraging start with a birdie from eight feet on the second.
Another birdie chance lipped out on the 12th as the tension mounted.
That he was eventually pipped by home player Julien Guerrier after dropping shots at the 12th, 13th and 18th would have been disappointing for the tall Ayrshireman but, nonetheless, it was an encouraging performance.
Long road: Koepka's journey now includes a US Open title
Justin Thomas was unable to sustain momentum after carding a 9-under 63 Saturday, the best round in relation to par at a U.S. One of the University of Texas junior's goals is to play in the Walker Cup on September 9-10 at Los Angeles Country Club.
Koepka then turned the screw with a nerveless trio of birdies to seize the crown. "Exhausted of traveling. I just wanted to be home", he said. "I played two good rounds, but it wasn't enough".
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